After dealing with these issues for a while, here are my suggestions. 1A) Check that all the blocks are in the content area, not separated by one block being in the header or footer area. 1) Rebuild the template from scratch. A pain, I know. But it seems that copying and re-using emails from previous ones degrades their ability to handle graphics correctly. Every couple years I have to start over. 2) If it's an image that won't correctly display full width (a problem I have often), I replace that image with a new image block. Just changing the background color doesn't work all the time. 3) When you try to replace an image that was linked to a url originally, it often won't open the right image dialog. When that happens, I drag an existing image from the library into the box, and then the "replace" button will function correctly. Workarounds, all, but maybe will help in a pinch.
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